The heat exchanger unit} equipment adopts manufacturing and processing technology

The heat exchange unit equipment is generally mainly man-made. The impermeable stone grinding equipment of the heat exchange unit and the processing and manufacturing process of its components. With the different structure of the heat exchange unit equipment, each component and processing process are different, and the mechanical processing performance of the heat exchange unit is similar to that of cast iron. However, the hardness of cast iron is lower than that of cast iron. Generally speaking, metal cutting tools can be used for processing. However, due to its poor strength and brittleness, twice impregnation and twice processing are used to improve the strength of cast iron and ensure the processing accuracy. Therefore, the transportation and use of materials and products should be handled with care, and the heat exchanger is strictly prohibited from littering, At the same time, it is strictly prohibited to knock with metal. At present, there are two methods to assemble the heat exchanger.

One is to stick the tubesheet, tube bundle and baffle on the support with adhesive, and then install them into the steel shell after the adhesive is cured, which is usually called outside the shell assembly. The other is to bond the heat exchanger in the shell with adhesive after trial assembly in the shell. Heat exchangers with a heat exchange area greater than 200m2 are generally assembled in the shell. Improper methods of using the heat exchanger will lead to pipe fracture or bonding joint leakage. We summarize the main reasons as follows:

The tubes of the heat exchange unit are heated unevenly. Due to the blocking heating rate, when the 2 system is heated up. It will cause the shell side pressure of the heat exchanger to rise sharply, the pipe will be broken due to impact, and some scaling will occur on the tubes. With the increase of service time, the expansion coefficient of the scaled heat exchange pipe is different from that of the non scaled heat exchange pipe, and the temperature difference stress is overloaded, resulting in the rupture of the heat exchange pipe.